A member shall not be credited with service for:
1. Except as otherwise provided in NRS 286.385, leave of absence without pay;
2. Overtime work;
3. Employment in a position which does not qualify the member for participation in the System;
4. Except as otherwise provided in NRS 286.501, more than 1 day within a day, 1 month within a month, or 1 year of service in any 12-month period; or
5. Any period for which compensation is not received by the member unless specifically otherwise provided in this chapter.